Variety of Living Organisms

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Living organisms come in a wide variety of forms. Biology classifies living organismso on the basis of their structure and how they function.


  • Smallest living things
  • Cannot be seen with a light microscope, only with an electron microscope.
  • Only reproduce inside the cells of other living organisms
  • Have a protein coat
  • Genetic material containing dna, or rna (ribonucleic acid)
  • Examples include HIV, Tobaccoo Mosaic Virus (causes discolouration of plant leaves)


  • Often single celled or can be clumped together
  • Visible with a light…


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